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O. Such - One of the best experts on this subject based on the ideXlab platform.

  • Mapped hemodynamic data acquisition by near infrared CCD imaging
    Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging , 1997
    Co-Authors: O. Such, S. Acker, V. Blazek
    Abstract:

    This paper presents undergoing research results of a near infrared CCD imaging system designed for mapped acquisition of hemodynamics data with inexpensive system components. This system is intended for use by clinicians and in phenological practice. The tests that can currently be done with this system are the classical Muscle Pump Test (MPT) and the Vein Occlusion Test (VOT). These are standard tests for venous disorders such as Chronic Vein Insufficiency (CVI) and deep Vein thrombosis (DVT). Photoplethysmographic (PPG) systems with NIR optical sensors are in wide use for these tests today. They essentially measure the blood volume changes in the top skin layers by registering the attenuation change in the near infrared. The new principle is based on this method but allows imaging of the Vein structure as well as mapping the physiological data to the image. A monochrome CCD camera equipped with a >700 nm filter is mounted on a tripod. A diffuse illumination is applied, then the test is performed. The camera takes a sequence of pictures of the perfusion area of interest, usually the lower leg. The sequence is then evaluated and filtered with digital filter algorithms. This allows calculation of parameters such as venous refilling time, venous pump power and venous drainage. These values are offered to the examiner as mapped data from several selectable regions. From this, conclusions can be taken as to the reason and location of disorders.

  • Near infrared CCD imaging of hemodynamics
    Proceedings of 18th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 1996
    Co-Authors: O. Such
    Abstract:

    This paper presents preliminary results of near infrared CCD imaging of hemodynamics with inexpensive system components. The motivation behind this is the requirement of a low-cost and easy to use system capable of aiding the physician in daily assessment of venous disorders such as Chronic Vein Insufficiency (CVI) and deep Vein thrombosis (DVT). Photoplethysmographic (PPG) systems with optical sensors are in wide use for these tests today. They essentially measure the blood volume in the top skin layers. Another method that has been described for imaging of Veins is near infrared photography. The presented method combines the two. A monochrome CCD camera equipped with a >700 nm filter is mounted on a tripod. A constant indirect illumination is applied, then an exercise is performed by the patient. The camera takes a sequence of pictures of the perfusion area of interest, i.e. the lower leg. Digital filtering and sequence evaluation results in image-mapped data about venous reflow time, venous pump power and other relevant parameters. From this, conclusions can be taken as to the reason and location of disorders.

Elena Kovacheska-bashuroska - One of the best experts on this subject based on the ideXlab platform.

Nikola Bakracheski - One of the best experts on this subject based on the ideXlab platform.

Violeta Mojsovska - One of the best experts on this subject based on the ideXlab platform.

Marija Zimbova - One of the best experts on this subject based on the ideXlab platform.